A Facebook spokesperson commented on the changes to the layout for pages on mobile:

This new look and feel makes it easier for a business’ current and potential customers to interact with a page in a way that’s tailored to mobile use. The interface is streamlined and action-oriented, with relevant business details and ways to interact (including Like, Call, Message, Share) where people look first – at the top of the page. Page owners can now include pinned posts near the top of the Page to highlight important content, and keep them highlighted.

Here’s what it looks like on mobile web (we’re still waiting for the update on Android):